Financial Instruments (Schedule Of Changes In Fair Value Of Level 3 Financial Assets) (Details) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||||||||
---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2011
|
Dec. 31, 2010
|
Dec. 31, 2011
Fair Value Inputs Level 1 [Member]
|
Dec. 31, 2010
Fair Value Inputs Level 1 [Member]
|
Dec. 31, 2011
Fair Value Inputs Level 2 [Member]
|
Dec. 31, 2010
Fair Value Inputs Level 2 [Member]
|
Dec. 31, 2010
Fair Value Inputs Level 3 [Member]
|
Dec. 31, 2010
Fair Value Inputs Level 3 [Member]
Long-Term Auction Rate Securities [Member]
|
Dec. 31, 2010
Fair Value Inputs Level 3 [Member]
Long-Term UBS Put [Member]
|
|
Fair Value Of Assets And Liabilities Measured On A Recurring Basis [Line Items] | |||||||||
Balance at beginning of period | $ 593,402 | $ 934,207 | $ 419,020 | $ 385,595 | $ 174,382 | $ 548,612 | $ 23,649 | $ 2,830 | |
Sale of auction rate securities and exercise of UBS Put | (23,849) | (2,687) | |||||||
Change in unrealized gain included in earnings | 200 | ||||||||
Change in unrealized loss included in earnings | (143) | ||||||||
Balance at end of period | $ 593,402 | $ 934,207 | $ 419,020 | $ 385,595 | $ 174,382 | $ 548,612 |